Vacuum valve of integrated die-casting die

Abstract

A vacuum valve of an integrated die-casting die comprises the die-casting die, a vacuum valve body, an oil cylinder and an exhaust pipe, the vacuum valve body and the oil cylinder are installed in a vacuum valve installation cavity and an oil cylinder installation cavity which are formed in the integrated die-casting die respectively, and a valve element arranged in an inner cavity of the vacuum valve body is connected with the oil cylinder. An inner cavity of the vacuum valve extends to the outside of the integrated die-casting die through an exhaust pipe, the inner cavity of the vacuum valve comprises a guide section, an exhaust section and a sealing section, a sealing sleeve is arranged in the guide section, a mounting hole is formed in one side of the exhaust section, the exhaust pipe is mounted in the mounting hole and communicated with the exhaust section, the sealing section is a stepped hole, and the exhaust pipe is arranged in the stepped hole. Wherein the diameter of the small-diameter section is the same as that of the air exhaust section, the middle-diameter section is a straight surface section and is used for forming straight surface sealing with the straight surface of the end head of the valve core, the large-diameter section is communicated with the cavity, a first inclined surface is arranged between the small-diameter section and the middle-diameter section and is used for forming inclined surface sealing with the inclined surface of the end head of the valve core, and a guide inclined surface is arranged between the middle-diameter section and the large-diameter section.

Description

Technical Field

[0001] The present invention relates to the field of vacuum valves, and particularly to a vacuum valve for an integrally die-cast mold. Background Art

[0002] The cavity of an existing integrally die-cast mold is relatively large, with a volume of about 3.3L - 3.5L and a pumping volume of 13 - 15L. The amount of gas to be pumped is relatively large, and multiple hydraulic vacuum valves need to be configured to pump vacuum to ensure that the vacuum degree is below 100 mbar, and even below 50 mbar.

[0003] However, only an inclined surface is provided at the front end of the inner cavity of the existing vacuum valve to cooperate with the inclined surface of the valve core to form a seal. The disadvantage of this structure is that if there are aluminum chips and oil stains that have not been blown away between the inclined surface of the inner cavity of the vacuum valve and the inclined surface of the valve core, it is easy to cause the inclined surface to be poorly sealed, and the aluminum liquid will enter the vacuum valve, causing the vacuum valve to be blocked. And after the valve core is used for a long time, plastic deformation in the length direction of the valve core is also likely to cause the vacuum valve to be poorly sealed, and the aluminum liquid will enter the vacuum valve, causing the vacuum valve to be blocked. Summary of the Invention

[0004] In view of the above problems, the present invention provides a vacuum valve for an integrally die-cast mold, which forms a seal by providing a first inclined surface and a first straight surface in the inner cavity of the vacuum valve to cooperate with the inclined surface and the straight surface of the valve core respectively, ensuring the high sealing performance of the vacuum valve and avoiding blockage of the vacuum valve.

[0005] The technical solution of the present invention is as follows: A vacuum valve for an integrally die-cast mold, including a die-casting mold, a vacuum valve, an oil cylinder, and an air extraction pipe. The vacuum valve and the oil cylinder are respectively installed in a vacuum valve installation cavity and an oil cylinder installation cavity provided inside the integrally die-cast mold. The valve core provided in the inner cavity of the vacuum valve is connected to the oil cylinder. The inner cavity of the vacuum valve extends to the outside of the integrally die-cast mold through the air extraction pipe. The inner cavity of the vacuum valve includes a guiding section, an air extraction section, and a sealing section. A sealing sleeve is provided in the guiding section. An installation hole is provided on one side of the air extraction section. The air extraction pipe is installed in the installation hole and communicates with the air extraction section. The sealing section is a stepped hole, where the diameter of the small-diameter section is the same as the diameter of the air extraction section. The middle-diameter section is a straight surface section for forming a straight surface seal with the straight surface of the valve core end. The large-diameter section communicates with the cavity. A first inclined surface is provided between the small-diameter section and the middle-diameter section for forming an inclined surface seal with the inclined surface of the valve core end. A guiding inclined surface is provided between the middle-diameter section and the large-diameter section.

[0006] Preferably, the inclination angle of the first inclined surface is 45° - 65°.

[0007] Preferably, the gap between the middle-diameter section and the straight surface of the valve core end is less than 0.05 mm.

[0008] Preferably, the height of the large-diameter section is greater than the height of the valve core end.

[0009] Preferably, the large-diameter section has a flared opening.

[0010] Preferably, a vacuum valve body pressing plate is fixed outside the vacuum valve installation cavity by bolts, and the vacuum valve body pressing plate is used to fix the vacuum valve in the vacuum valve installation cavity.

[0011] The advantages of the present invention are as follows: 1. The vacuum valve and the valve core of the present invention adopt double seals, namely inclined-plane seal and straight-plane seal. The double seals can increase the effectiveness of the seal and avoid loose sealing.

[0012] 2. When the valve core of the vacuum valve of the present invention retracts, if the concentricity between the vacuum valve and the valve core is out of tolerance, that is, when the straight-plane seal has loose sealing, the inclined-plane seal can make up for the deviation and ensure the overall sealing effect of the vacuum valve.

[0013] 3. When the valve core of the vacuum valve of the present invention retracts, if there are residual aluminum chips and oil stains on the side of the valve core, the residual aluminum chips and oil stains on the side of the valve core can be scraped off through the first straight-plane of the vacuum valve, ensuring the overall sealing effect of the vacuum valve.

[0014] Glossary Integrated die-casting: Integrated die-casting is an innovative manufacturing process that integrates multiple complex part structures on the automotive body-in-white into a single part through die-casting technology. It was first proposed by Tesla in 2019 and applied to the production of the rear floor of Model Y in 2020. This technology injects molten metal into a mold through a large die-casting machine to form the final part, thus achieving one-time molding of multiple parts. It not only simplifies the manufacturing process but also improves production efficiency, bringing new possibilities for the lightweight of the automotive industry. Brief Description of the Drawings

[0015] Figure 1 Partial cross-sectional view of the integrated die-casting mold of the present invention; Figure 2 Assembly drawing of the vacuum valve, valve core, oil cylinder, and air extraction pipe of the present invention; Figure 3 is Figure 2 Enlarged view of part A of Figure 4 Cross-sectional view of the valve core of the present invention; Figure 5 Cross-sectional view of the vacuum valve of the present invention; Figure 6 is Figure 5 Enlarged view of part B of Detailed Description of the Invention

[0016] See Figures 1 to 6, a vacuum valve for an integrally die-cast mold, comprising a die-casting mold 1, a vacuum valve 2, an oil cylinder 3, and an air extraction pipe 4. The vacuum valve 2 and the oil cylinder 3 are respectively installed in a vacuum valve installation cavity and an oil cylinder installation cavity 5 provided inside the integrally die-cast mold 1. A valve core 6 provided inside the vacuum valve 2 is connected to the oil cylinder 3. The inner cavity of the vacuum valve 2 extends to the outside of the integrally die-cast mold 1 through the air extraction pipe 4. The inner cavity of the vacuum valve 2 includes a guiding section 20, an air extraction section 21, and a sealing section 23. A sealing sleeve 201 is provided inside the guiding section 20. An installation hole 23 is provided on one side of the air extraction section 21. The air extraction pipe 4 is installed in the installation hole 23 and is communicated with the air extraction section 21. The sealing section 23 is a stepped hole, where the diameter of the small-diameter section is the same as the diameter of the air extraction section 21. The middle-diameter section 232 is a straight surface section for forming a straight surface seal with the straight surface of the valve core end 61. The large-diameter section is communicated with the cavity, and the large-diameter section has a flared opening. The purpose of this setting is that when the valve core 6 is pushed out for air extraction, the flared opening can leave a larger air extraction gap, improving the air extraction speed. A first inclined surface 231 is provided between the small-diameter section and the middle-diameter section 232 for forming an inclined surface seal with the inclined surface of the valve core end 61. The inclination angle of the first inclined surface 231 is 45° - 65°. The purpose of this setting is that even if aluminum chips and oil stains enter the inclined surface of the valve core end 61 or the first inclined surface 231, they can easily converge to the straight surface section and be scraped off. A guiding inclined surface 233 is provided between the middle-diameter section 232 and the large-diameter section for guiding the straight surface of the valve core end 61 to prevent the straight surface of the valve core end 61 from directly colliding with the middle-diameter section 232 and causing damage. The gap between the middle-diameter section 232 and the straight surface of the valve core end 61 is less than 0.05 mm. The purpose of this setting is to ensure the sealing performance of the straight surface seal. The height of the large-diameter section is greater than the height of the valve core end 61 to prevent the valve core end 61 from colliding with the cavity when the valve core end 61 is pushed out to extract air from the cavity, causing damage to the valve core end 61 or the cavity. A vacuum valve body pressing plate 7 is fixed outside the vacuum valve installation cavity through bolts. The vacuum valve body pressing plate 7 is used to fix the vacuum valve 2 in the vacuum valve installation cavity. The purpose of this setting is that compared with the prior art, it is not necessary to disassemble the entire die-casting mold to replace the vacuum valve 2. When the vacuum valve 2 fails, only the vacuum valve body pressing plate 7 needs to be removed to quickly replace the vacuum valve 2, greatly improving the efficiency of replacing the vacuum valve 2.

[0017] When the present invention is in use, first, the valve core 6 is pushed out to the large-diameter section. At this time, the vacuum valve 2 is in the open state, and the vacuum valve 2 evacuates or blows air into the mold cavity through the suction pipe 4. The main purpose of evacuation is to remove the air in the mold cavity and maintain a high-vacuum state; the main purpose of blowing is to blow out the aluminum chips or oil and dirt brought into the vacuum valve 2 during evacuation to prevent valve blockage. Then, the valve core 6 retracts to its original position, that is, the end 61 of the valve core forms double seals of an inclined plane and a straight plane with the first inclined plane 231 and the middle-diameter section 232 of the sealing section respectively. At this time, the vacuum valve closes, and the mold starts die-casting, and the molten aluminum starts to fill.

[0018] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention fall within the protection scope of the present invention.

Claims

1. A vacuum valve for an integrally die-cast mold, comprising a die-casting mold (1), a vacuum valve (2), an oil cylinder (3), and an air extraction pipe (4). The vacuum valve (2) and the oil cylinder (3) are respectively installed in a vacuum valve installation cavity and an oil cylinder installation cavity (5) provided inside the integrally die-cast mold (1). A valve core (6) provided in the inner cavity of the vacuum valve (2) is connected to the oil cylinder (3). The inner cavity of the vacuum valve (2) extends to the outside of the integrally die-cast mold (1) through the air extraction pipe (4), and is characterized in that: The inner cavity of the vacuum valve (2) includes a guiding section (20), an air extraction section (21), and a sealing section (23). A sealing sleeve (201) is arranged in the guiding section (20). An installation hole (23) is arranged on one side of the air extraction section (21). An air extraction pipe (4) is installed in the installation hole (23) and communicated with the air extraction section (21). The sealing section (23) is a stepped hole. The diameter of the small-diameter section is the same as that of the air extraction section (21). The middle-diameter section (232) is a straight-face section for forming a straight-face seal with the straight face of the valve core end (61). The large-diameter section is communicated with the cavity. A first inclined surface (231) is arranged between the small-diameter section and the middle-diameter section (232) for forming an inclined-surface seal with the inclined surface of the valve core end (61). A guiding inclined surface (233) is arranged between the middle-diameter section (232) and the large-diameter section.

2. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The inclination angle of the first inclined surface (231) is 45° - 65°.

3. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The gap between the middle-diameter section (232) and the straight face of the valve core end (61) is less than 0.05 mm.

4. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The height of the large-diameter section is greater than the height of the valve core end (61).

5. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: The large-diameter section has a flared opening.

6. The vacuum valve of the integrated die-casting mold according to claim 1, characterized in that: A vacuum valve body pressing plate (7) is fixed outside the vacuum valve installation cavity through bolts. The vacuum valve body pressing plate (7) is used to fix the vacuum valve (2) in the vacuum valve installation cavity.

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